Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2024		Jun. 30, 2023		Jun. 30, 2024		Jun. 30, 2023		Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		$ 1,004,233		$ 1,254,060		$ 1,004,233		$ 1,254,060
2022		2,118,510		2,719,387		2,118,510		2,719,387
2021		2,394,060		2,350,389		2,394,060		2,350,389
2020		2,015,632		1,776,962		2,015,632		1,776,962
2019		1,523,125		916,206		1,523,125		916,206
Prior		3,575,338		3,336,946		3,575,338		3,336,946
Revolving Loans		1,760,092		1,782,674		1,760,092		1,782,674
Revolving converted to Term		9,952		3,287		9,952		3,287
Total loans		14,400,942	[1]			14,400,942	[1]			$ 14,278,070
Total loans		14,400,942		14,139,911		14,400,942		14,139,911		14,278,070
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024						1,499		1,003
2023						0		0
2022						28		0
2021						0		0
2020						0		0
Prior						0		41
Revolving Loans						162		23,538
Revolving converted to Term						0		0
Total		808		23,767		1,689		24,582
Commercial And Industrial [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		236,182		255,703		236,182		255,703
2022		211,882		214,342		211,882		214,342
2021		139,952		119,210		139,952		119,210
2020		66,308		99,895		66,308		99,895
2019		48,408		51,056		48,408		51,056
Prior		138,534		121,787		138,534		121,787
Revolving Loans		761,486		861,226		761,486		861,226
Revolving converted to Term		0		0		0		0
Total loans		1,602,752	[1]			1,602,752	[1]			1,579,986
Total loans		1,602,752		1,723,219	[1]	1,602,752		1,723,219	[1]	1,579,986
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024						0		0
2023						0		0
2022						0		0
2021						0		0
2020						0		0
Prior						0		34
Revolving Loans						0		23,437
Revolving converted to Term						0		0
Total		0		23,190		0		23,471
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	[2]	223,337		255,397		223,337		255,397
2022	[2]	209,490		206,214		209,490		206,214
2021	[2]	138,897		117,268		138,897		117,268
2020	[2]	65,456		98,942		65,456		98,942
2019	[2]	48,408		49,317		48,408		49,317
Prior	[2]	138,382		120,734		138,382		120,734
Revolving Loans	[2]	688,496		819,928		688,496		819,928
Revolving converted to Term	[2]	0		0		0		0
Total loans	[1],[2]	1,512,466				1,512,466
Total loans	[1],[2]			1,667,800				1,667,800
Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		10,745		136		10,745		136
2022		2,230		1,331		2,230		1,331
2021		1,055		660		1,055		660
2020		367		805		367		805
2019				653				653
Prior		115		666		115		666
Revolving Loans		46,629		27,334		46,629		27,334
Revolving converted to Term		0		0		0		0
Total loans	[1]	61,141				61,141
Total loans	[1]			31,585				31,585
Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		2,100		170		2,100		170
2022		162		6,797		162		6,797
2021		0		1,282		0		1,282
2020		485		148		485		148
2019		0		1,086		0		1,086
Prior		37		387		37		387
Revolving Loans		26,361		13,964		26,361		13,964
Revolving converted to Term		0		0		0		0
Total loans	[1]	29,145				29,145
Total loans	[1]			23,834				23,834
Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		0		0		0		0
2020		0		0		0		0
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	0				0
Total loans	[1]			0				0
Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		0		0		0		0
2020		0		0		0		0
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	0				0
Total loans	[1]			0				0
Commercial Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		511,109		571,770		511,109		571,770
2022		1,177,449		1,250,448		1,177,449		1,250,448
2021		1,224,827		1,470,500		1,224,827		1,470,500
2020		1,344,407		1,353,762		1,344,407		1,353,762
2019		1,216,572		679,243		1,216,572		679,243
Prior		2,579,366		2,419,604		2,579,366		2,419,604
Revolving Loans		97,403		66,612		97,403		66,612
Revolving converted to Term		672		857		672		857
Total loans		8,151,805	[1]			8,151,805	[1]			8,041,508
Total loans		8,151,805		7,812,796	[1]	8,151,805		7,812,796	[1]	8,041,508
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024						0		0
2023						0		0
2022						0		0
2021						0		0
2020						0		0
Prior						0		0
Revolving Loans						0		0
Revolving converted to Term						0		0
Total		0		0		0		0
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		483,165		508,627		483,165		508,627
2022		1,102,879		1,189,436		1,102,879		1,189,436
2021		1,169,539		1,384,305		1,169,539		1,384,305
2020		1,277,585		1,318,126		1,277,585		1,318,126
2019		1,168,111		662,064		1,168,111		662,064
Prior		2,427,116		2,264,182		2,427,116		2,264,182
Revolving Loans		97,051		66,612		97,051		66,612
Revolving converted to Term		672		857		672		857
Total loans	[1]	7,726,118				7,726,118
Total loans	[1]			7,394,209				7,394,209
Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		7,552		62,601		7,552		62,601
2022		6,587		22,115		6,587		22,115
2021		29,574		72,507		29,574		72,507
2020		53,526		15,215		53,526		15,215
2019		43,884		3,268		43,884		3,268
Prior		140,827		131,636		140,827		131,636
Revolving Loans		352		0		352		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	282,302				282,302
Total loans	[1]			307,342				307,342
Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		20,392		542		20,392		542
2022		67,983		24,678		67,983		24,678
2021		25,714		13,688		25,714		13,688
2020		13,296		20,421		13,296		20,421
2019		4,577		13,911		4,577		13,911
Prior		3,792		23,786		3,792		23,786
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	135,754				135,754
Total loans	[1]			97,026				97,026
Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		14,219		0		14,219
2021		0		0		0		0
2020		0		0		0		0
2019		0		0		0		0
Prior		7,631		0		7,631		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	7,631				7,631
Total loans	[1]			14,219				14,219
Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		0		0		0		0
2020		0		0		0		0
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	0				0
Total loans	[1]			0				0
Construction Loans [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		128,869		138,267		128,869		138,267
2022		162,237		506,185		162,237		506,185
2021		319,677		247,726		319,677		247,726
2020		122,552		52,659		122,552		52,659
2019		5,476		48,062		5,476		48,062
Prior		24,984		4,749		24,984		4,749
Revolving Loans		21,426		25,148		21,426		25,148
Revolving converted to Term		1,522		0		1,522		0
Total loans		786,743	[1]			786,743	[1]			849,586
Total loans		786,743		1,022,796	[1]	786,743		1,022,796	[1]	849,586
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024						0		0
2023						0		0
2022						0		0
2021						0		0
2020						0		0
Prior						0		0
Revolving Loans						0		0
Revolving converted to Term						0		0
Total		0		0		0		0
Construction Loans [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		116,191		112,698		116,191		112,698
2022		162,237		489,700		162,237		489,700
2021		310,484		247,726		310,484		247,726
2020		96,884		48,793		96,884		48,793
2019		5,476		48,062		5,476		48,062
Prior		24,984		4,749		24,984		4,749
Revolving Loans		21,426		25,148		21,426		25,148
Revolving converted to Term		1,522		0		1,522		0
Total loans	[1]	739,204				739,204
Total loans	[1]			976,876				976,876
Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		2,090		16,910		2,090		16,910
2022		0		5,023		0		5,023
2021		0		0		0		0
2020		5,911		3,866		5,911		3,866
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	8,001				8,001
Total loans	[1]			25,799				25,799
Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		10,588		8,659		10,588		8,659
2022		0		11,462		0		11,462
2021		9,193		0		9,193		0
2020		19,757		0		19,757		0
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	39,538				39,538
Total loans	[1]			20,121				20,121
Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		0		0		0		0
2020		0		0		0		0
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	0				0
Total loans	[1]			0				0
Construction Loans [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		0		0		0		0
2020		0		0		0		0
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	0				0
Total loans	[1]			0				0
Small Business [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		30,909		26,649		30,909		26,649
2022		47,953		54,133		47,953		54,133
2021		47,224		41,998		47,224		41,998
2020		35,542		28,679		35,542		28,679
2019		23,469		14,902		23,469		14,902
Prior		32,358		25,508		32,358		25,508
Revolving Loans		51,815		45,223		51,815		45,223
Revolving converted to Term		0		0		0		0
Total loans		269,270	[1]			269,270	[1]			251,956
Total loans		269,270		237,092	[1]	269,270		237,092	[1]	251,956
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024						0		0
2023						0		0
2022						28		0
2021						0		0
2020						0		0
Prior						0		0
Revolving Loans						141		87
Revolving converted to Term						0		0
Total		60		59		169		87
Small Business [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		30,468		26,279		30,468		26,279
2022		47,442		53,998		47,442		53,998
2021		47,136		41,861		47,136		41,861
2020		35,359		28,187		35,359		28,187
2019		22,867		14,902		22,867		14,902
Prior		31,641		24,741		31,641		24,741
Revolving Loans		50,424		43,853		50,424		43,853
Revolving converted to Term		0		0		0		0
Total loans	[1]	265,337				265,337
Total loans	[1]			233,821				233,821
Small Business [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		48		0		48		0
2022		122		0		122		0
2021		21		0		21		0
2020		99		157		99		157
2019		150		0		150		0
Prior		242		216		242		216
Revolving Loans		727		305		727		305
Revolving converted to Term		0		0		0		0
Total loans	[1]	1,409				1,409
Total loans	[1]			678				678
Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		393		370		393		370
2022		389		135		389		135
2021		67		137		67		137
2020		84		335		84		335
2019		452		0		452		0
Prior		475		551		475		551
Revolving Loans		664		1,065		664		1,065
Revolving converted to Term		0		0		0		0
Total loans	[1]	2,524				2,524
Total loans	[1]			2,593				2,593
Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		0		0		0		0
2020		0		0		0		0
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	0				0
Total loans	[1]			0				0
Small Business [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		0		0		0		0
2020		0		0		0		0
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	0				0
Total loans	[1]			0				0
Residential Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		86,414		246,831		86,414		246,831
2022		492,023		652,380		492,023		652,380
2021		627,025		411,534		627,025		411,534
2020		393,627		188,875		393,627		188,875
2019		181,265		91,726		181,265		91,726
Prior		659,292		629,938		659,292		629,938
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans		2,439,646	[1]			2,439,646	[1]			2,424,754
Total loans		2,439,646		2,221,284	[1]	2,439,646		2,221,284	[1]	2,424,754
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024						0		0
2023						0		0
2022						0		0
2021						0		0
2020						0		0
Prior						0		0
Revolving Loans						0		0
Revolving converted to Term						0		0
Total		0		0		0		0
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		86,414		246,831		86,414		246,831
2022		492,023		652,380		492,023		652,380
2021		627,025		411,534		627,025		411,534
2020		393,627		188,281		393,627		188,281
2019		180,537		91,726		180,537		91,726
Prior		656,400		627,591		656,400		627,591
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	2,436,026				2,436,026
Total loans	[1]			2,218,343				2,218,343
Residential Real Estate [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		0		0		0		0
2020		0		594		0		594
2019		728		0		728		0
Prior		2,892		2,347		2,892		2,347
Revolving Loans		0		0		0		0
Revolving converted to Term		0		0		0		0
Total loans	[1]	3,620				3,620
Total loans	[1]			2,941				2,941
Home Equity Loan [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		10,406		14,533		10,406		14,533
2022		26,383		41,442		26,383		41,442
2021		35,142		57,879		35,142		57,879
2020		52,280		52,017		52,280		52,017
2019		47,471		30,658		47,471		30,658
Prior		139,187		132,915		139,187		132,915
Revolving Loans		798,180		763,524		798,180		763,524
Revolving converted to Term		7,758		2,430		7,758		2,430
Total loans	[1]	1,116,807				1,116,807
Total loans		1,116,807		1,095,398	[1]	1,116,807		1,095,398	[1]	$ 1,097,626
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024						0		0
2023						0		0
2022						0		0
2021						0		0
2020						0		0
Prior						0		0
Revolving Loans						11		0
Revolving converted to Term						0		0
Total		11		0		11		0
Home Equity Loan [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		10,406		14,533		10,406		14,533
2022		26,383		41,442		26,383		41,442
2021		35,059		57,879		35,059		57,879
2020		52,280		52,017		52,280		52,017
2019		47,471		30,658		47,471		30,658
Prior		138,993		132,915		138,993		132,915
Revolving Loans		795,978		762,582		795,978		762,582
Revolving converted to Term		7,523		2,288		7,523		2,288
Total loans	[1]	1,114,093				1,114,093
Total loans	[1]			1,094,314				1,094,314
Home Equity Loan [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		83		0		83		0
2020		0		0		0		0
2019		0		0		0		0
Prior		194		0		194		0
Revolving Loans		2,202		942		2,202		942
Revolving converted to Term		235		142		235		142
Total loans	[1]	2,714				2,714
Total loans	[1]			1,084				1,084
Consumer Loan [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		344		307		344		307
2022		583		457		583		457
2021		213		1,542		213		1,542
2020		916		1,075		916		1,075
2019		464		559		464		559
Prior		1,617		2,445		1,617		2,445
Revolving Loans		29,782		20,941		29,782		20,941
Revolving converted to Term		0		0		0		0
Total loans	[1]	33,919				33,919
Total loans	[1]			27,326				27,326
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024						1,499		1,003
2023						0		0
2022						0		0
2021						0		0
2020						0		0
Prior						0		7
Revolving Loans						10		14
Revolving converted to Term						0		0
Total						1,509		1,024
Consumer Loan [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		344		307		344		307
2022		583		457		583		457
2021		213		1,542		213		1,542
2020		916		1,075		916		1,075
2019		464		559		464		559
Prior		1,617		2,445		1,617		2,445
Revolving Loans		29,781		20,940		29,781		20,940
Revolving converted to Term		0		0		0		0
Total loans	[1]	33,918				33,918
Total loans	[1]			27,325				27,325
Consumer Loan [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2023		0		0		0		0
2022		0		0		0		0
2021		0		0		0		0
2020		0		0		0		0
2019		0		0		0		0
Prior		0		0		0		0
Revolving Loans		1		1		1		1
Revolving converted to Term		0		0		0		0
Total loans	[1]	$ 1				$ 1
Total loans	[1]			$ 1				$ 1

[1] Loan origination dates in the tables above reflect the original origination date, or the date of a material modification of a previously originated loan.

[2] Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances and the associated gross write-offs.